Don't waste your time with this game, honestly. I have a lot of patience with H games, but jesus christ this game is a slog.
Legitimately your first few hours or so will be going upstairs to grab a key, to go downstairs to grab a key, to go upstairs to grab a key to repeat this over and over and over in the exact same environment fighting the same 4 enemies until you get out of the school and then get completely overrun by screenfuls of enemies.
Terrible game, horrendous controls, not worth the H scenes.
I bought this game on dlsite a few days ago. I wouldn't even recommend playing it for free